Inductance system



Au 11, 1931. A, M, TROGNQ 1,818,363

INDUCTANCE SYSTEM Filed Jan. 25.1929 v 2 Sheets-Sheet 2 I-NVENTORJ I CIA/(gym 913, 540W,

gmagw ATTORNEY.

Patented Aug. 11, 1931 UNITED. STATES PATENT OFFICE ARTHUR H. TROGNER, OF EAST ORANGE, NEW JERSEY, A SSIGNOR T WIRED RADIO, INCL, OF NEW YORK, N. Y., A CORPORATION OF DELAWABE INDUCTANGE SYSTEM Application filed -3'anuary 25, 1929. Serial No. 335,110.

My invention relates to inductance systerms in general and more specifically to in ductance systems employed in high frequency signaling.

An object of my invention is to provide an inductance system whereby any value of inductance may be easily and readily obtained.

' Another object of my invention is to pro- 1 vide an inductance system wherein any of several inductance values may be connected to an external circuit.

Still another object of my invention is to provide an inductance system wherein any of several individual inductances may be associated with an external circuit without appreciable loss of efliciency.

Other and further objects of my invention reside in certain structural features more fully described in the specification fol- I lowing and illustrated in the accompanying drawings wherein Fig. 1 shows an end elevation of an embodiment of the inductance system of my invention; Fig. 2 shows a similar view of another embodiment of the inductance system of my invention; and Fig. 3 shows a fragmentary detail view of the inductance shown in Fig. 2.

r In high frequency inductance systems in general it is frequently desired to change the value of the inductance. This is usually accomplished by employing an inductance having a plurality of accessible contact members and the change in inductance is effected by changing the connections of the external circuit to these contact members. Many disadvantages arise from this method of adjusting the value of inductance employed. The change of inductance is slow and this subtracts from the over all efiiciency of the transmitting system when an immediate change of inductance is desired.- Further disadvantages of this method are the losses incurred in the portion of the inductance not in use. In high frequency transmitters it is often necessary to change the operating frequency of the system with out undue delay and to maintain the efliciency of the system substantially the same .50 at the new frequency adjustment. In the inductance system of my invention the foregoing disadvantages of other systems are avoided as will appear from the specification following and the accompanying drawlngs.

Referring to Fig. 1 in detail, a plurality of inductances are supported concentrically and adapted to be selectively associated with an external circuit. These inductances are shown as four in number; however any number of inductances of any suitable design may be employed. Inductances 1, 2, 3 and 4 comprise helical coils of metallic ribbon or tubing wound on suitable coil forms or cross members. Inductances 1, 2, 3 and 4 are supported by star shaped end members 5 and 6 arranged perpendicular to the axes of the coils.

A shaft 7 passes through and is secured to the centers of supporting members 5 and 6. Shaft 7 is supported by members 8 and 8a, the latter provided with suitable bearings to allow shaft 7 to rotate therein. The whole is supported by the frame 9- of the transmitter or in any convenient manner depending upon the particular application of the inductance system. Shaft 7 may extend through panel 10 and a control handle provided on the front of the panel to rotate the inductance in the proper position or shaft 7 may be rotated in any suitable manner such as by sprocket and chain, gear trains or'belting systems as desired. Inductance coils 1, 2, 3 and 4 are provided with contact members 1 1 1 2 2 2 3 a e and 4 4 4", respectively. Stationary contact members 11, 12 and 13 are supported in any convenient manner to engage with contact members 1*, 1 and 1 respectively. Stationary contact members 14, 15 and 16 are adapted to engage with the contact members carried by inductance coils 2, 3 and 4 when these coils are moved into the position occupied by coil 1 as shown in the accompanying drawing. Stationary contact members 11, 12, 13, 14, 15, and 16 are supported by rods 17, 18 and 19. Rods 17, 18'and 19 may be of metal or any suitable conductin material. Any con venient arrangement 0 contact members 11, 12, 13, 14, 15 and 16 may be employed as may number of contact members.

also any number of contact. members desired.

Fig. 2 shows a s stem of inductances generally similar to ig. 1, composed however of metallic conductor of curvilinearly bounded cross-section. The reference characters 101-119 in Fig. 2 correspond to reference characters 119 in Fig. 1. Fig. 3 is a detail view showing a fragmentary side elevation partly in section of one of the conductors shown in Fig. 2.

Many modifications of my invention are possible without departing from the spirit of my invention. An number of individual inductance coils may lie employed, associated with and adapted to be associated with any The inductance coils may be of either tubing or ribbon and may be of base metals or any alloys thereof. Any number of such inductance systems as shown in the accompanying drawings, may be mechanically or electrically, or both mechanically and electrically connected together, and of any different inductance values desired. It is to be understood that the embodiments of my invention are not to be restricted by the foregoing'specification or by the accompan ing rawing but only by the limitations 0 the nded claims.

p at I claim as new and desire to secure by Letters Patent of the United States is as follows:

1. In an inductance system, a plurality of helical single layerinductor elements, a rotatable frame provided with a plurality of supporting arms, each of said arms carrying one of said inductor elements, inductor connectors attached to each of said inductor elements at separate points thereof, a plurality of stationary contactors, and supporting rods for carrying said stationary contactors, said stationary contactors being adapted and positioned to engage said inductor connectors as said frame is rotated, whereby the inductance connected between said stationary contactors may be varied. Y

2. In an inductance system, a plurality of helical single layer inductor elements formed of metallic ribbon, a rotatable frame provided with a plurality of supporting arms, each of said arms carrying one of said inductor elements, inductor connectors attached to each of said inductor elements at separate points thereof, a plurality of stationary contactors, and supporting rods for carrying said stationary contactors, said stationary contactors being adapted and positioned to engage said inductor connectors as 'said frame is'rotated, whereby the inductance connected between said stationary contactors ma be varied.

'. 3. In an in uctancesystem, a plurality of helical single layer inductor elements formed of metallic conductor of curvilinearly bounded cross-section, a rotatable frame provided with a plurality of supporting arms, each of said arms carrying one of said inductor elements, inductor connectors attached to each of said inductor elements at separate points thereof, a plurality of stationary contactors, and supporting rods for carrying'said stationary contactors, said stationary contactors being adapted and positioned to engage said inductor connectors as said frame is rotated, whereby the inductance connected between said stationary contactors. may be varied.

4. In an inductance system, a plurality of helical single layer inductor elements, a rotatable frame provided with a plurality of supporting arms, each of said arms carrying one of said inductor elements, inductor connectors attached to each of said inductor elements at terminal points thereof, a plurality of stationary contactors, and supporting rods for carrying said stationary contactors said stationary contactors being adapted and positioned to engage said inductor conneck tors as said frame is rotated, whereby the inductance connected between said stationary contactors may be varied.

5. In an inductance system, a plurality of helical single layer inductor elements formed of metallic conductor of curvilinearly bounded cross-section, a rotatable frame provided with a plurality of supporting arms, each of said arm carrying one of said inductor elements, inductor connectors at tached to each of said inductor elements at terminal points thereof, a plurality of stationary contactors, and supporting rods for carrying said stationary contactors, said stationary contactors being adapted and positioned to engage said inductor connectors as said frame is rotated, ,Whereby the induc-' tance connected between said stationary contactors may be varied.

ARTHUR M. TROGNER. 

